| BRBeelman Ready Mix | Benton | — | ◇ UNVERIFIED |
| BRBeelman Ready-mix, INC. | Breese | — | ◇ UNVERIFIED |
| BCB-k Concrete | Warrenville | — | ◇ UNVERIFIED |
| BCBlager Concrete Company | Clinton | — | ◇ UNVERIFIED |
| BBBlomberg Bros INC | Farina | — | ◇ UNVERIFIED |
| BPBmi Products of Northern Il INC | Antioch | — | ◇ UNVERIFIED |
| BBBob Barnett Ready-mix | Harrisburg | — | ◇ UNVERIFIED |
| BBBob Barnett Ready Mix INC | Carmi | — | ◇ UNVERIFIED |
| BBBob Barnett Ready-mix INC | Equality | — | ◇ UNVERIFIED |
| BGBolingbrook Glass & Mirror, INC. | Bolingbrook | — | ◇ UNVERIFIED |
| BQBolingbrook Quality Mix | Bolingbrook | — | ◇ UNVERIFIED |
| BIBrandenburg Industrial Service CO | Macomb | — | ◇ UNVERIFIED |
| BCBrandt Construction CO | Colona | — | ◇ UNVERIFIED |
| BOBreckenridge of Il | Madison | — | ◇ UNVERIFIED |
| BOBreckenridge of Illinois LLC | Alton | — | ◇ UNVERIFIED |
| BOBreckenridge of Illinois LLC | Columbia | — | ◇ UNVERIFIED |
| BOBreckenridge of Illinois LLC | Collinsville | — | ◇ UNVERIFIED |
| CRCanton Ready-mix INC | Havana | — | ◇ UNVERIFIED |
| CRCanton Ready-mix INC | Canton | — | ◇ UNVERIFIED |
| CRCanton Redi Mix INC | Canton | — | ◇ UNVERIFIED |
| CRCanton Redi-mix Portable Plt | Dallas City | — | ◇ UNVERIFIED |
| CRCapitol Ready Mix | Mount Pulaski | — | ◇ UNVERIFIED |
| CRCapitol Ready-mix, INC. | Springfield | — | ◇ UNVERIFIED |
| CSCarrara Stone Systems of Chicago, LLC. | Mundelein | — | ◇ UNVERIFIED |
| CRCci Redi Mix INC | Mattoon | — | ◇ UNVERIFIED |
| CCCemstone Concrete Materials | Altona | — | ◇ UNVERIFIED |
| CSCentury Surfaces LLC | Addison | — | ◇ UNVERIFIED |
| CPCgc Products LLC | Naperville | — | ◇ UNVERIFIED |
| CDChicago Dept of Transportation | Chicago | — | ◇ UNVERIFIED |
| CFChicago Fire Brick CO | Chicago | — | ◇ UNVERIFIED |
| COCity of Pana | Pana | — | ◇ UNVERIFIED |
| CGClassic Garden Ornaments, LTD. | Pomona | — | ◇ UNVERIFIED |
| CWClifford W. Estes, Co., INC. | Ottawa | — | ◇ UNVERIFIED |
| CSCoady Supply Co., INC. | Springfield | — | ◇ UNVERIFIED |
| CEComax Enterprises, INC. | Riverdale | — | ◇ UNVERIFIED |
| CRCommunity Ready Mix of Beardstown INC | Beardstown | — | ◇ UNVERIFIED |
| CRCommunity Ready Mix of Pittsfield INC | Pittsfield | — | ◇ UNVERIFIED |
| CBConcrete & Block CO | Aurora | — | ◇ UNVERIFIED |
| CSConcrete Supply LLC | Pontoon Beach | — | ◇ UNVERIFIED |
| CSConcrete Supply LLC | Waterloo | — | ◇ UNVERIFIED |
| CSConcrete Supply LLC | Troy | — | ◇ UNVERIFIED |
| CSConcrete Supply, L.l.c Dba Concrete Supply of Illinois | East Saint Louis | — | ◇ UNVERIFIED |
| CUConcrete Unit Step CO INC | Collinsville | — | ◇ UNVERIFIED |
| C4Con-e-co 427 | Grand Chain | — | ◇ UNVERIFIED |
| CCContractors Concrete INC | Effingham | — | ◇ UNVERIFIED |
| CBCordray Bros INC | Garden Prairie | — | ◇ UNVERIFIED |
| CACorrie Art Glass | Monticello | — | ◇ UNVERIFIED |
| CRCortelyou Ready Mix LLC | Bushnell | — | ◇ UNVERIFIED |
| CSCosmic Surfaces, INC. | Schaumburg | — | ◇ UNVERIFIED |
| CGCosmos Granite & Marble | Wood Dale | — | ◇ UNVERIFIED |
